JP3092672B2 - Rare earth-Fe-Co-B anisotropic magnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to R having excellent magnetic anisotropy and a small temperature coefficient of coercive force (where R is
At least one of the rare earth elements containing Y), F
R-Fe-Co-B containing e, Co, and B as main components
The present invention relates to a system anisotropic magnet. More specifically, the anisotropic magnet is an R-Fe- formed of a hot press molded body or a hot isostatic press (hereinafter, referred to as HIP) molded body.
It relates to a Co-B based anisotropic magnet.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
R-Fe-Co-B obtained by subjecting an R-Fe-Co-B-based master alloy represented by -Fe-B system to hydrogen treatment
Based permanent magnet powder is described.

This R-Fe-Co-B permanent magnet powder is composed of a ferromagnetic phase of R ₂ (Fe, Co) ₁₄ B type intermetallic compound phase (hereinafter, R ₂ (Fe, Co) ₁₄ B type phase). the R-Fe-Co-B-based master alloy as a main phase of) that as a raw material, and RHx by heat-treating the mother alloy material in an _{H 2} atmosphere in a predetermined temperature range (Fe, _{Co) 2} B and the balance after prompting phase transformation to each phase of Fe, de _{H 2} steps in removing and _{H 2} from the raw material processing (hereinafter, this process is referred to HDDR process) is again ferromagnetic phase by subjecting the _R 2 (Fe, Co )
₁₄ B phase was formed and the resulting R
-The structure of the Fe-Co-B-based permanent magnet powder has an average particle size of:
Extremely fine R ₂ (Fe, Co) of 0.05 to 3 μm
_{It has a} texture with the recrystallized structure of the _14B type phase as the main phase.

[0004] The above R-Fe-Co-B permanent magnet powder does not provide sufficient magnetic anisotropy only by hot pressing to form a hot pressed compact.
As described in JP-A-39503, the hot-pressed product is further subjected to hot rolling such as hot rolling to orient the C-axis of the recrystallized grains of the R ₂ (Fe, Co) ₁₄ B phase. The magnetic anisotropy was improved by using a reduced rolling structure.

[0005]

However, the R-F obtained by hot-rolling the above hot-pressed body is further used.
Although the e-Co-B hot rolled magnet has excellent magnetic anisotropy, the temperature coefficient of coercive force is increased as compared with a magnet in which the above-mentioned permanent magnet powder is hot pressed, and this R-Fe-
When a Co-B-based hot rolled magnet is incorporated in a motor or the like, there is a problem that the performance of the motor or the like changes due to a change in temperature and the stability is lacking.

[0006] The R-Fe-Co-B rolled magnet is
Variations in the working ratio depending on the location lead to variations in the magnetic anisotropy, and in order to prevent this, the process of hot plastic working had to be complicated.

[0007]

Means for Solving the Problems Accordingly, the present inventors have
Since the increase in the temperature coefficient of the coercive force is caused by hot-rolling a hot-pressed product, if a magnet having excellent magnetic anisotropy can be obtained without performing the hot-rolling, As a result of conducting research based on the recognition that the temperature coefficient of coercive force does not increase, (1) R: 10 to 20%, Co: 0.1
５０50%, B: 3-20%, and the total of Ga and Zr, the total of Ga and Hf, or the total of Ga, Zr and Hf: 0.001 to
The main phase is a composition containing 5.0%, the balance being Fe and unavoidable impurities, and an R ₂ (Fe, Co) ₁₄ B type intermetallic compound phase having a tetragonal structure obtained by HDDR treatment. A recrystallized grain texture in which recrystallized grains are aggregated adjacent to each other, and the recrystallized grain texture has a ratio b / a of the shortest grain size a to the longest grain size b of each recrystallized grain. Recrystallized grains having a shape having a value of less than 2 are present in an amount of 50% by volume or more of all recrystallized grains, and the recrystallized grains constituting the recrystallized texture have an average recrystallized grain size of 0.05 to 20 μm. (2) R: 10 to 20%, Co: 0.1 to
50%, B: 3 to 20%, and the total of Ga and Zr, the total of Ga and Hf, or the total of Ga, Zr and Hf: 0.001 to
Containing 5.0%, further, Al, 1 or two or more of the total of V and Si: contains 0.01% to 2.0%, the composition of the remainder being Fe and inevitable impurities, H
R ₂ (Fe, having a tetragonal structure obtained by DDR processing)
A recrystallized grain texture in which recrystallized grains having a Co) ₁₄ B type intermetallic compound phase as a main phase are aggregated adjacent to each other, and the recrystallized grain texture is the shortest of the individual recrystallized grains. Recrystallized grains having a shape in which the ratio b / a of the particle diameter a to the longest particle diameter b is less than 2 are present at 50% by volume or more of all the recrystallized grains, and the recrystallized grains constituting the recrystallized texture described above. Has an average recrystallized particle size of 0.
The R-Fe-Co-B-based anisotropic magnet composed of a hot-press molded body or a HIP molded body having a size of 0.5 to 20 µm has excellent magnetic properties without increasing the temperature coefficient of coercive force. They obtained the knowledge of showing anisotropy.

The present invention has been made on the basis of this finding, and has a small temperature coefficient of coercive force of a hot-pressed or HIP compact having the above composition and recrystallized grain texture. -B-based anisotropic magnet has characteristics.

According to the present invention, the temperature coefficient of coercive force of R-
The Fe-Co-B-based anisotropic magnetic force has little variation in magnetic anisotropy depending on the location and has excellent corrosion resistance as compared with a conventional rolled magnet.

Further, the R-Fe-B anisotropic magnet of the present invention has a recrystallized grain texture, so that R ₂ (F, C
o) In the vicinity of the composition of the _14B type compound, that is, R _11.8 Fe _bal B
_5.9 Has excellent magnetic anisotropy and high coercive force even near the composition.

Next, a method for producing the R-Fe-Co-B-based anisotropic magnet of the present invention will be described.

The raw material powder for producing the R-Fe-Co-B based anisotropic magnet of the present invention is melt-cast to obtain a total of Ga and Zr, a total of Ga and Hf, or a total of Ga and Z.
R- and Rf contained so that the total of r and Hf is a predetermined amount.
In addition to the Fe-Co-B-based master alloy and this alloy,
An R-Fe-Co-B-based mother alloy containing one or more of 1, V, and Si so as to have a predetermined component composition is manufactured, and this R-Fe-Co-B-based mother alloy is produced. The temperature is raised in a hydrogen gas atmosphere, and heat treatment is performed in a hydrogen gas atmosphere or a mixed gas atmosphere of a hydrogen gas and an inert gas at a temperature of 500 to 1000 ° C., and then a temperature of 500 to 1000 ° C. and a hydrogen gas pressure of 1 Torr. It is manufactured by performing a dehydrogenation treatment until the following vacuum atmosphere or an inert gas atmosphere of hydrogen gas partial pressure: 1 Torr or less and then cooling.
The temperature: 500 to 1000 ° C., in a hydrogen gas atmosphere or
Is heat-treated in a mixed gas atmosphere of hydrogen gas and inert gas.
RH _X , (Fe, Co) ₂ B and the balance of Fe
Promote phase transformation in each phase, then temperature: 500-1000
° C, hydrogen gas pressure: vacuum atmosphere of 1 Torr or less or
Hydrogen gas partial pressure: Establish an inert gas atmosphere of 1 Torr or less.
Dehydrogenation until the ferromagnetic phase R
_{When the 2} (Fe, Co) ₁₄ B-type phase is formed,
Very fine R ₂ (Fe, C
o) Re-aggregation of recrystallized grains of ₁₄ B-type phase
It becomes a crystal texture.

The sum of Ga and Zr, Ga and H
An R-Fe-Co-B-based master alloy containing a predetermined amount of the total of f or the total of Ga, Zr and Hf at a temperature of 600 to
By adding a step of homogenizing at 1200 ° C. and a step of heat-treating at a temperature of 300 to 1000 ° C. after the above dehydrogenation treatment, R having more excellent magnetic anisotropy can be obtained.
-Fe-Co-B permanent magnet powder can be manufactured.

The sum of the above Ga and Zr, Ga and H
An R—Fe—Co—B-based master alloy containing a predetermined amount of the total of f or the total of Ga, Zr and Hf and further containing a predetermined amount of one or more of Al, V, and Si at a temperature: R-Fe-C obtained by adding a step of homogenizing at 600 to 1200 ° C and a step of heat treating at a temperature of 300 to 1000 ° C after the above dehydrogenation treatment.
The oB-based permanent magnet powder has an excellent maximum energy product in addition to the excellent magnetic anisotropy.

The R-Fe-Co thus produced is
-B system tissues of the permanent magnet powder is intragranular and grain boundaries R ₂ is not an impurity or strain (Fe, Co) ₁₄ recrystallization recrystallized grains of B-type intermetallic compound phase are assembled adjacent to each other It is composed of a texture.

It is sufficient if the average recrystallized grain size of the recrystallized grains constituting the recrystallized texture is in the range of 0.05 to 20 μm. More preferably, it is within the range of 0.05 to 3 μm.

Each of the recrystallized grains having the above-mentioned dimensions preferably has a shape in which the ratio of the shortest particle diameter a to the longest particle diameter b is b / a <2. It is necessary that 50% by volume or more of the crystal grains exist. By having a recrystallized grain shape in which the ratio b / a of the shortest particle diameter a to the longest particle diameter b is smaller than 2, the coercive force of the R-Fe-Co-B-based permanent magnet powder is improved and the corrosion resistance is also improved. The coercive force temperature coefficient α at 25 to 100 ° C.
iHc is smaller than 0.6% / ° C.

Further, the thus-produced RF
The recrystallized structure of the e-Co-B-based permanent magnet powder is such that recrystallized grains are aggregated adjacent to each other and substantially no R ₂ (Fe, Co) ₁₄ B type intermetallic compound has almost no grain boundary phase. Since it has a recrystallized texture composed solely of phases, the value of magnetization can be increased by the absence of the grain boundary phase, and corrosion that progresses through the grain boundary phase is suppressed, and heat Since there is no stress strain due to the inter-plastic working, the possibility of stress corrosion is small, and the corrosion resistance is improved.

R-Fe-C having the above recrystallized texture
When the oB-based permanent magnet powder is pressed in a magnetic field to form a green compact, and the green compact is hot-pressed or hot isostatically pressed at a temperature of 600 to 900 ° C., the R-Fe-Co
The R-Fe-Co-B-based anisotropic magnet of the present invention, in which the structure of the -B-based permanent magnet powder is kept almost as it is, can be produced, and if necessary, heat-treated at 300 to 1000C. The coercive force can be improved. When normal sintering is performed on the green compact in a vacuum or a non-oxidizing atmosphere, the sintering temperature is too high, the recrystallized grains grow and become large recrystallized grains, and the magnetic properties, particularly the coercive force, decrease. Is not preferred. Since the application of magnetic anisotropy is performed by molding in a magnetic field, it is not necessary to perform hot plastic working after hot pressing and HIP.

Next, the reason why the component composition, recrystallized grain size and recrystallized grain shape of the R-Fe-Co-B anisotropic magnet of the present invention are limited as described above will be described.

(A) R R is Nd, Pr, Tb, Dy, La, Ce, Ho, E
one or more of r, Eu, Sm, Gd, Tm, Yb, Lu, and Y, generally mainly Nd;
Tb, Dy, and Pr are particularly effective in improving the coercive force iHc, and may be used by adding other rare earth elements thereto, even if the R content is lower than 10% or 20%.
%, The coercive force of the anisotropic magnet decreases, and excellent magnetic properties cannot be obtained. Therefore, the content of R is 10 to
It was set to 20%.

(B) BB If the B content is lower than 3% or higher than 20%, the coercive force of the anisotropic magnet is reduced, and excellent magnetic properties cannot be obtained. Was determined to be 3 to 20%. A part of B may be replaced with C, N, O, or F.

(C) Co The addition of Co improves the coercive force and magnetic temperature characteristics (for example, Curie point) of the anisotropic magnet, and further has the effect of improving the corrosion resistance. .1
If the content is less than 50%, the desired effect cannot be obtained. On the other hand, if the content exceeds 50%, the magnetic properties are rather deteriorated. Therefore, the content of Co is set to 0.1 to 50%. When the content of Co is between 0.1 and 20%, the coercive force becomes highest, so that it is more preferable that the content of Co be 0.1 to 20%.

(D) Ga, Zr, and Hf These components are contained as components of the R-Fe-Co-B-based anisotropic magnet to improve coercive force and have excellent magnetic anisotropy and corrosion resistance. Has an effect of stably imparting, the total of Ga and Zr, the total of Ga and Hf,
Alternatively, if the total content of Ga, Zr and Hf is less than 0.001%, the desired effect cannot be obtained, while if the content exceeds 5.0%, the magnetic properties deteriorate. Therefore, the sum of Ga and Zr, the sum of Ga and Hf, or Ga, Zr
And Hf were determined to be 0.001 to 5.0%.

(E) Al, V and Si: R—Fe—Co—B system containing 0.001 to 5.0% of Ga, Zr and Hf, or Ga, Zr and Hf in total Al, V for permanent magnet alloy
The maximum energy product can be stably increased by adding one or more of Si and Si, but if the content is less than 0.01%, the desired effect cannot be obtained. Addition of more than 0% is not preferable because the value of magnetization cannot be increased.

Therefore, one of Al, V and Si
The species or two or more species are determined in a total amount of 0.01 to 2.0%.

(F) Average recrystallized grain size and its shape R ₂ constituting the structure of the R—Fe—Co—B based anisotropic magnet
If the average recrystallized grain size of the (Fe, Co) ₁₄ B-type phase recrystallized grains is smaller than 0.05 μm, magnetization becomes difficult, which is not preferable. On the other hand, if it is larger than 20 μm, coercive force and squareness are reduced. And high magnetic properties cannot be obtained.

Therefore, the average recrystallized grain size is 0.05 to
It was set to 20 μm. In this case, the average recrystallized grain size is more preferably 0.05 to 3 μm which is close to the size of the single magnetic domain grain size (0.3 μm). The individual recrystallized grains having the above dimensions preferably have a shape in which the ratio of the shortest particle size a to the longest particle size b is (b / a) <2. It is necessary that 50% by volume or more of the grains be present.

By having a recrystallized grain shape in which the ratio b / a of the shortest particle diameter a to the longest particle diameter b is smaller than 2, R-F
The coercive force of the e-Co-B-based anisotropic magnet is improved, the corrosion resistance is improved, and the temperature coefficient of the coercive force is reduced. Therefore, the value of b / a of the individual recrystallized grains is set to less than 2.

[0030]

EXAMPLES The present invention will be specifically described based on Examples and Comparative Examples.

Co obtained by plasma melting and casting, and Ga and Zr, Ga and Hf, or Ga, Z
R-Fe-Co- contained in the combination of r and Hf
Various B-based alloy ingots, Ga, Zr and H
An R-Fe-Co-B alloy ingot containing no f is prepared, and these alloy ingots are homogenized in an argon gas atmosphere at a temperature of 1120 ° C. for 40 hours. About 2 ingots
It was crushed to 0 mm square to obtain a raw material alloy. This raw material alloy was heated from room temperature to 830 ° C. in a hydrogen atmosphere of 1 atm,
Heat treatment was performed in a hydrogen atmosphere maintained at 0 ° C. for 4 hours, and then dehydrogenation was performed at 830 ° C. and a degree of vacuum of 1 × 10 ⁻¹ Torr or less.

Since the various alloy ingots subjected to such treatment are in a state of being easily broken, they were lightly crushed in a mortar to obtain various R-Fe-Co-B permanent magnet powders having an average particle size of 50 μm. These various R-Fe-Co-B permanent magnet powders are press-molded in a magnetic field of 25 KOe to produce green compacts, and these green compacts are heated at a temperature of 700 ° C and a pressure of 1.5.
Hot pressing was performed under the condition of Ton / cm ² . The green compact molded in the magnetic field was hot-pressed while being arranged so that the orientation direction coincided with the pressing direction at the time of hot pressing. Further, this hot press molded body was heat-treated in a vacuum at 620 ° C. for 2 hours. The anisotropic magnets 1 to 6 of the present invention and the comparative anisotropic magnets 1 to 10 having the component compositions shown in Tables 1 and 2 thus obtained all have a density of 7.5 to 7.6 g / cm ^3.
It was dense enough.

Further, for comparison, an R- alloy manufactured from an alloy ingot containing neither Ga, Zr, nor Hf was used.
The Fe-Co-B-based permanent magnet powder was filled and sealed in a copper can in a vacuum, heated to 700 ° C. and rolled several times until the rolling reduction reached 80%, and the conventional anisotropic magnet shown in Table 2 was obtained. Produced.

The structures of the anisotropic magnets 1 to 6 of the present invention, comparative anisotropic magnets 1 to 10 and conventional anisotropic magnets shown in Tables 1 and 2 were observed with a scanning electron microscope, and the average recrystallized grain size and individual The abundance (volume%) of recrystallized grains having a value of (longest particle diameter / shortest particle diameter of recrystallized grains smaller than 2), temperature coefficient of coercive force αiHc, and magnet of hot pressed compact obtained by pressing in a magnetic field The magnetic properties were measured, and these measured values are shown in Tables 3 and 4.

The temperature coefficient of coercive force αiHc is determined by the coercive force iHc at ₂₅ ° C. and the coercive force α at 100 ° C.
iHc ₁₀₀ was measured, and the ratio of the difference in the coercive force (iHc ₂₅
−iHc ₁₀₀ ) / iHc ₂₅ divided by a temperature difference of 75 ° C.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

[Table 4]

From the results shown in Tables 1 to 4, it is found that Ga and Zr, Ga and Hf, or Ga, Zr and Hf of the present invention.
It can be seen that the anisotropic magnets 1 to 6 of the present invention, which are included in the total of the combinations, have excellent magnetic properties, particularly the maximum energy product (BH) max and residual magnetic flux density, and have excellent magnetic anisotropy. The anisotropic magnets 1 to 6 of the present invention are Ga, Z
The magnetic properties are almost the same as those of the conventional anisotropic magnet which is a rolled magnet containing no r and Hf, but the temperature coefficient of coercive force αiHc is remarkably small at about -0.5% / ° C. Comparative anisotropic magnets containing no Ga, Zr, or Hf at all, and whose contents deviate from the conditions of the present invention.
Indicates that the magnetic properties and magnetic anisotropy are reduced.

Further, G obtained by high-frequency melting and casting.
a and Zr, Ga and Hf, or R-Fe-Co-B-based alloys contained in combination of Ga, Zr and Hf, and further various kinds of component compositions further containing one or more of Al, V, and Si Alloy ingots were prepared, and these ingots were subjected to the same average particle size as those of the anisotropic magnets 1 to 6 of the present invention and the comparative anisotropic magnets 1 to 10 under the same conditions as those described above.
A 40 μm R-Fe-Co-B permanent magnet powder was manufactured, and the R-Fe-Co-B permanent magnet powder was press-molded in a magnetic field and without a magnetic field to produce a green compact. The powder was hot isostatically pressed under the conditions of temperature: 710 ° C. and pressure: 1.7 Ton / cm ² , and the anisotropic magnet 7 of the present invention and the comparative anisotropic magnets 11 to 11 having the component compositions shown in Table 5 13 was produced.

With respect to these anisotropic magnets, as described above, the average recrystallized grain size and the abundance (volume%) of recrystallized grains in which the value of the longest grain size / shortest grain size of each recrystallized grain is smaller than 2 And the coercive force temperature coefficient αiHc were measured, and the magnetic properties were also measured. The measured values are shown in Table 6.

[0043]

[Table 5]

[0044]

[Table 6]

From the results in Tables 5 and 6, Ga and Z
r, total of Ga and Hf, or total of Ga, Zr and Hf: 0.001 to 5.0 atomic%, and one or more of Al, V and Si are added to 0.0
By adding 1 to 2.0 atomic%, the maximum energy product is further improved, the temperature coefficient of coercive force αiHc is reduced, and the size and shape of the recrystallized grains have a great effect on reducing the temperature coefficient of coercive force. You can see that there is.

[0046]

According to the present invention, Ga and Z can be used together with Co.
By containing r, Ga and Hf, or a combination of Ga, Zr and Hf, a remarkable magnetic anisotropy is exhibited by using only the hydrogen-treated powder without performing hot plastic working, and the coercive force has a small temperature coefficient. R-Fe-C
An oB-based magnet can be obtained, which brings about an excellent effect of improving the performance and stability of an electric device such as a motor.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshinari Ishii 1-297 Kitabukurocho, Omiya City, Saitama Prefecture Mitsubishi Materials Real Co., Ltd. (72) Inventor Tamotsu Ogawa 1-2297 Kitabukurocho, Omiya City, Saitama Mitsubishi Materials Real (56) References JP-A-63-282239 (JP, A) JP-A-2-263404 (JP, A)

Claims (5)

(57) [Claims] 1. At least one of rare earth elements containing Y
An R-Fe-Co-B-based anisotropic magnet containing a seed (hereinafter, referred to as R), Fe, Co, and B as main components, wherein the anisotropic magnet has an atomic percentage of R: 10 to 10%. 20%, Co: 0.1-50
%, B: 3 to 20%, total of Ga and Zr, total of Ga and Hf, or total of Ga, Zr and Hf: 0.001 to 5.0%,
And RHx and (Fe, Co) ₂ B by heat treatment in an H ₂ atmosphere.
After prompting phase transformation to each phase of the balance Fe and, H with deionized H ₂ steps
₂ (hereinafter, this process is called HDDR process).
R ₂ (Fe, Co) having a tetragonal structure obtained
₁₄ a recrystallized grain texture in which recrystallized grains having a B-type intermetallic compound phase as a main phase are aggregated adjacent to each other, and the recrystallized grain texture is the shortest grain size of each recrystallized grain. a
Recrystallized grains having a ratio b / a of less than 2 with respect to the longest particle diameter b are present at 50% by volume or more of all recrystallized grains, and the average recrystallized grains constituting the recrystallized texture are recrystallized. A rare-earth-Fe-Co-B-based anisotropic magnet, which is a hot-press formed body having a crystal grain size of 0.05 to 20 µm. 2. An R-form containing R, Fe, Co and B as main components.
This is an Fe—Co—B based anisotropic magnet, and this anisotropic magnet is expressed as: atomic percentage: R: 10 to 20%, Co: 0.1 to 50%, B: 3 to 20%, Ga and Zr total, Ga and Hf total, or Ga, Zr and Hf total: 0.001 to 5.0%,
And a total of one or more of Al, V and Si:
A composition containing 0.01 to 2.0%, the balance being Fe and unavoidable impurities; and R ₂ (F having a tetragonal structure obtained by HDDR treatment.
e, Co) ₁₄ B-type intermetallic compound phase having a recrystallized grain having a main phase and a recrystallized grain texture in which the recrystallized grain texture is composed of individual recrystallized grains. Shortest particle size a
And the recrystallized grains having a ratio b / a of less than 2 with respect to the longest particle size b are present in 50% by volume or more of all the recrystallized grains, and the average recrystallized grains constituting the recrystallized texture are recrystallized. A rare earth-Fe-Co-B-based anisotropic magnet, which is a hot-press formed body having a crystal grain size of 0.05 to 20 µm. 3. An R-form containing R, Fe, Co, and B as main components.
This is an Fe—Co—B based anisotropic magnet, and this anisotropic magnet is expressed as: atomic percentage: R: 10 to 20%, Co: 0.1 to 50%, B: 3 to 20%, Ga and Zr total, Ga and Hf total, or Ga, Zr and Hf total: 0.001 to 5.0%,
And a balance consisting of Fe and unavoidable impurities, and R ₂ (F ₂₎ having a tetragonal structure obtained by HDDR treatment.
e, Co) ₁₄ B-type intermetallic compound phase having a recrystallized grain having a main phase and a recrystallized grain texture in which the recrystallized grain texture is composed of individual recrystallized grains. Shortest particle size a
And the recrystallized grains having a ratio b / a of less than 2 with respect to the longest particle size b are present in 50% by volume or more of all the recrystallized grains, and the average recrystallized grains constituting the recrystallized texture are recrystallized. Hot isostatic pressing having a crystal grain size of 0.05 to 20 μm
A rare earth-Fe-Co-B-based anisotropic magnet, wherein the magnet is shaped . 4. An R-form containing R, Fe, Co and B as main components.
This is an Fe—Co—B based anisotropic magnet, and this anisotropic magnet is expressed as: atomic percentage: R: 10 to 20%, Co: 0.1 to 50%, B: 3 to 20%, Ga and Zr total, Ga and Hf total, or Ga, Zr and Hf total: 0.001 to 5.0%,
And a total of one or more of Al, V and Si:
A composition containing 0.01 to 2.0%, the balance being Fe and unavoidable impurities; and R ₂ (F having a tetragonal structure obtained by HDDR treatment.
e, Co) ₁₄ B-type intermetallic compound phase having a recrystallized grain having a main phase and a recrystallized grain texture in which the recrystallized grain texture is composed of individual recrystallized grains. Shortest particle size a
And the recrystallized grains having a ratio b / a of less than 2 with respect to the longest particle size b are present in 50% by volume or more of all the recrystallized grains, and the average recrystallized grains constituting the recrystallized texture are recrystallized. Hot isostatic pressing having a crystal grain size of 0.05 to 20 μm
A rare earth-Fe-Co-B-based anisotropic magnet, wherein the magnet is shaped . 5. The average recrystallized particle size is 0.05 to 3 μm.
The rare-earth-Fe-Co-B-based anisotropic magnet according to claim 1, 2 , 3, or 4, wherein m is m.